Submission #51587

#	Time	Username	Problem	Language	Result	Execution time	Memory
51587		MatheusLealV	Martian DNA (IOI16_dna)	C++17	100 / 100	18 ms	756 KiB

dna

#include "dna.h"

#include <bits/stdc++.h>

using namespace std;

int bsearch1(int n)
{
	int ini = 1, fim = n, mid, best;

	while(fim >= ini)
	{
		mid = (ini + fim)/2;

		string aux;

		for(int i = 1; i <= mid; i++) aux += "0";

		if(make_test(aux)) best = mid, ini = mid + 1;

		else fim = mid - 1;
	}

	return best;
}

string analyse(int n, int t) 
{
    string ans, S, resp;

    int mz = bsearch1(n);

    for(int i = 0; i < mz; i++) ans += "0";

    for(int i = 1; i <= n - mz; i++)
    {
    	if(make_test(ans + "1")) ans += "1";

    	else
    	{
    		int qtdz = 0;

    		for(int j = ans.size() - 1; j >= 0; j--)
    		{
    			if(ans[j] != '0') break;

    			qtdz ++;
    		}

    		if(qtdz > mz) break;

    		ans += "0";
    	}
    }

    int ini = mz - 1, fim = n - 1, mid, best;

    while(fim >= ini)
    {
    	mid = (ini + fim)/2;

    	string aux;

    	for(int i = 0; i <= mid; i++) aux += ans[i];

    	if(make_test(aux)) best = mid, ini = mid + 1;

    	else fim = mid - 1;
    }

    for(int i = 0; i <= best; i++) S += ans[i];

    for(int resta = 1; resta < n - best; resta ++)
    {
    	if(make_test("1" + S)) S = "1" + S;

    	else S = "0" + S;
    }

    return S;
}                       

Compilation message (stderr)

dna.cpp: In function 'int bsearch1(int)':
dna.cpp:24:9: warning: 'best' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return best;
         ^~~~
dna.cpp: In function 'std::__cxx11::string analyse(int, int)':
dna.cpp:71:22: warning: 'best' may be used uninitialized in this function [-Wmaybe-uninitialized]
     for(int i = 0; i <= best; i++) S += ans[i];
                    ~~^~~~~~~
grader.cpp: In function 'bool make_test(std::__cxx11::string)':
grader.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < p.size(); i++) {
                  ~~^~~~~~~~~~
grader.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i <= ss.size(); i++) {
                  ~~^~~~~~~~~~~~
grader.cpp:28:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (pr[i] == p.size()) {

• Subtask 1: 11 / 11
• Subtask 2: 25 / 25
• Subtask 3: 64 / 64